Abstract: An imaging lens in which a positive first lens group, a positive second lens group, and a negative third lens group are arranged in order from the object side. The first lens group includes a positive first lens having a convex object-side surface and a second lens. The second lens group includes third and fourth lenses each having at least one aspheric surface. The third lens group includes a fifth lens, a sixth lens as a double-sided aspheric lens, and a seventh lens having a concave image-side surface near an optical axis. The lenses are not joined to each other, the seventh lens has an aspheric image-side surface whose shape changes from concave to convex as the distance from the optical axis increases, and an F-number is less than 1.8.

Abstract: Provided is a driving method for a beam steering device having a metasurface optical phased array, the beam steering device includes a nano-antenna, a conductor, and an active layer arranged therebetween. The driving method includes comparing a first voltage to be applied to a first electrode of one of the nano-antenna and the conductor, with a second voltage applied immediately before the first voltage, and applying a correction voltage the first electrode of the other of the nano-antenna and the conductor and then applying the first voltage. The correction voltage is applied to the first electrode and has an electrical polarity different from an electrical polarity of the second voltage.

Abstract: Systems and methods for imaging tissue are described. Particularly, systems and methods of imaging an inner limiting membrane, epi-retinal membrane, or posterior vitreous cortex of a patient's eye are disclosed. Imaging an inner limiting membrane, epi-retinal membrane, or posterior vitreous cortex may include applying a stain to the inner limiting membrane, epi-retinal membrane, or posterior vitreous cortex of the patient's eye, causing the stain to produce fluorescent light having a wavelength within a near-infrared range, capturing the fluorescent light, and producing an Optical Coherence Tomography (OCT) image of the inner limiting membrane, epi-retinal membrane, or posterior vitreous cortex with an OCT imaging system that is configured to detect light within the near-infrared range.

Abstract: Disclosed herein are embodiments of a porous aluminum oxide thin film having a surface RMS roughness value of less than 1 nm. The thin film may also comprise phosphorus. The disclosed thin films may have a refractive index of from 1 to 2, such as from 1 to 1.5. Also disclosed are embodiments of as method for making the disclosed thin films, comprising forming an aqueous solution of the alumina precursor, a surfactant and optionally a phosphorus-containing precursor, and depositing the solution on a substrate.

Abstract: A lens barrel has a first lens-holding frame that holds a first lens group; a second lens-holding frame that holds a second lens group; and a lens-barrel casing. A first lens-driving unit drives the first lens-holding frame in the optical axis direction. A second lens-driving unit drives the second lens-holding frame in the optical axis direction. The first lens-driving unit is fixed to the fixing member. The second lens-driving unit is fixed to the first lens-holding frame.

Abstract: In present invention, various embodiments provide a photothermotropic composite film. The composite film comprises a matrix and one or more nanostructures comprising a metal oxide semiconductor which is configured to convert radiant energy to thermal energy. The matrix has a property which is changeable based on the thermal energy received by the matrix from the metal oxide semiconductor. In a preferred embodiment, hybridization of the poly(N-isopropylacrylamide) (PNIPAM) hydrogel and antimony-tin oxide (ATO) is provided as the composite film. In this film, the ATO absorbs at near-infrared (NIR) region and acts as nanoheater to induce the optical switching of the hydrogel. The behaviour of this composite film can be used as a new generation of autonomous passive smart windows for climate-adaptable solar modulation.

Abstract: A target adjustment apparatus may be provided. The target adjustment apparatus may include an optical targeting device having a first zero. The target adjustment apparatus may further include an optical adjustment lens removably disposed in a line of sight between a target and the optical targeting device. The optical adjustment lens may shift a target image before it reaches the optical targeting device, creating a second zero.

Abstract: The present disclosure relates generally to multi-layer display devices including electrochromic material and methods of making the same. The display device may include one or more of a first layer comprising a first substrate depicting a display pattern; a second layer comprising an electrochromic polymer; a third layer comprising a solid state electrolyte; a fourth layer comprising a charge storage layer; a fifth layer comprising a second substrate, and/or other components. The one or more of the second layer, the third layer, and/or the fourth layer may be interposed between the first layer and the fifth layer. An application of a voltage between the first substrate and the second substrate may case a change in transmission and/or reflectance of light through the display device such that the display pattern on the first substrate may be displayed.

Abstract: A vibration wave actuator has a vibration member including an elastic member and an electro-mechanical energy transducer, and a contact member in contact with the vibration member, and the contact member and the vibration member move relative to each other. The vibration wave actuator includes a detected portion configured to move, together with the contact member, relative to the vibration member, and a detection unit configured to move, together with the vibration member, relative to the contact member to detect displacement information or position information for the detected portion. The vibration member has two projections provided side by side in a direction intersecting with the direction of the relative movement. The contact member contacts the two projections. The detection unit and the detected portion are located between the contact member and the vibration member when viewed from the direction of the relative movement.

Abstract: An apparatus is described that selectively absorbs electromagnetic radiation. The apparatus includes a conducting surface, a dielectric layer formed on the conducting surface, and a plurality of conducting particles distributed on the dielectric layer. The dielectric layer can be formed from a material and a thickness selected to yield a specific absorption spectrum. Alternatively, the thickness or dielectric value of the material can change in response to an external stimulus, thereby changing the absorption spectrum.

Abstract: A near-eye display system includes a polarization waveguide having an in-coupling interface disposed proximate to a first end and an out-coupling interface disposed proximate to an opposite second end. The polarization waveguide is configured to convey light incident at the in-coupling interface to the out-coupling interface by inducing multiple changes in a polarization state of the light as the light traverses the polarization waveguide. At least a subset of the changes in polarization state induce the light to reflect within the polarization waveguide without relying on total internal reflection (TIR).

Abstract: A lens barrel that is capable of detecting an absolute position of a movable part with high accuracy. A first guide guides the movable part with an optical lens. A first sensor unit includes a first scale and first detection unit. The first scale in the movable part has a pattern that makes a signal output from the first detection unit monotonically increase. The first detection unit outputs the signal that continuously varies according to the movement. A second sensor unit includes a second scale in the movable part that has a periodic repeated pattern and a second detection unit that outputs a periodic signal by reading the second scale. A controller detects a position of the movable part based on the signals output from the first and second detection units. The first sensor unit is arranged nearer to the first guide in comparison with the second sensor unit.

Abstract: The present disclosure is directed to lens, methods of making, designing lens and/or methods using lens in which performance may be improved by providing one or more steps in the central portion of the optical zone and one or more steps in the peripheral portion of the optic zone. In some embodiments, such lens may be useful for correcting refractive error of an eye and/or for controlling eye growth.

Abstract: A goggle may include a goggle frame, a lens assembly magnetically coupled to the goggle frame, and first and second retention features securing the lens assembly to the goggle frame at first and second locations, respectively, to resist decoupling of the lens assembly from the goggle frame. The lens assembly may be removable from the goggle frame by actuating only one of the first retention feature or the second retention feature. A method of removing a lens assembly from a goggle frame may include actuating a first latch securing the lens assembly to the goggle frame; after actuating the first latch, pivoting the lens assembly away from the goggle frame about a second latch securing the lens assembly to the goggle frame; and after pivoting the lens assembly, laterally translating the lens assembly away from the second latch without actuating the second latch.

Abstract: Systems and methods according to present principles provide ways to construct and use tunable exceptional point (EP) singularities in three-dimensional plasmonic nanostructures. Such structures have applications in sensing, communication, imaging, and other fields where, e.g., determining sub wavelength features of interest is of value.

Abstract: Optical texture analysis of the inner retina, including the retinal nerve fiber layer (RNFL), ganglion cell layer (GCL), or inner plexiform layer (IPL), or a combination of these layers, can be used to detect and quantify RNFL/GCL/IPL abnormalities. From a set of scans of a retina, anterior and posterior boundaries of an inner retinal layer of interest can be determined. Optical density measurements at specific locations on the retina and depths within the layer of interest can be extracted from the scans. From these measurements, a set of optical texture signature values corresponding to different locations can be computed, where the optical texture signature value for a given location provides information about a tissue composition of the inner retinal layer at that location. The texture signature values can provide a topographical map of a retinal layer, which can facilitate detection and quantification of abnormalities.

Abstract: A system for identifying structures in an eye of a subject. In embodiments of the invention, the system has a housing; a visible light source supported by the housing; an infrared light source supported by the housing; a photodetector supported by the housing; a patient interface disposed on an outer surface of the housing arranged and configured so that, when the patient interface is placed in contact with the subject, the subject's eye is aligned with the light sources and the photodetector such that the light sources illuminate an iris of the eye at an angle between 15° and 30° and such that the photodetector receives light from the light sources reflected by the iris; and a controller configured to activate the visible light source and the infrared light source and to obtain image information from the photodetector.

Abstract: Thin-film devices, for example, multi-zone electrochromic windows, and methods of manufacturing are described. In certain cases, a multi-zone electrochromic window comprises a monolithic EC device on a transparent substrate and two or more tinting zones, wherein the tinting zones are configured for independent operation.

Abstract: An inclination adjusting mechanism includes a first member that is attachable to a connection portion of a lens unit that is connectable to a lens barrel; a second member that faces the first member and that is attachable to a connection portion of the lens barrel that is connectable to the lens unit; contact members that are fixed to the first member, that protrude from the first member toward the second member, and that contact the second member; and adjusting/fixing members that are capable of adjusting an inclination of the first member relative to the second member and capable of fixing the first member to the second member. The second member has an inclined surface that the contact members contact, and each of the contact members has a curved surface that contacts the inclined surface.

Abstract: An organic compound according to one embodiment of the present invention is an organic compound represented by general formula (1). Each of X1 and X2 is an alkyl group or the like that may have a substituent. Each of R11 to R18 is a hydrogen atom, an alkyl group that may have a substituent, or the like. Each of R21 and R22 is a hydrogen atom, an alkyl group that may have a substituent, or the like. A1? and A2? independently represent a monovalent anion, respectively.